I will start my answer with a question?Are you sure that your winchester model 70 was made by winchester in 1948?I ask this because the 300 win.magnum was not a chambering that was available until the late 1950,s.The cartridge was based on a 458 winchester magnum case that was necked down.The 458 winchester came into being in 1956-1958.It also spawned the 264 win.mag caliber,and the .338 win mag caliber.I would expect that your winchester model 70 rifle was rechambered at some point in time if it is indeed a winchester model 70 made in 1948.This can also be said if we are talking about the .300 weatherby mag chambering.
Only if it has been rebarrelled to that caliber. Original chambering was .30-06. email@example.com
Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
It would be seven thousand.
Around 50 different calibers, anything from a .17 Rem to a 458 Winchester mag.
the 599 GTB WRONG it is the ferrari 458 italia
500 USD or so
it was made in 1958
458 = 45800%
The speed of light is 299 792 458 meters per second
The positive integer factors of 458 are: 1, 2, 229, 458